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-rw-r--r--2020/input/twelve.txt760
-rw-r--r--2020/twelve.nim62
2 files changed, 822 insertions, 0 deletions
diff --git a/2020/input/twelve.txt b/2020/input/twelve.txt
new file mode 100644
index 0000000..16cc747
--- /dev/null
+++ b/2020/input/twelve.txt
@@ -0,0 +1,760 @@
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diff --git a/2020/twelve.nim b/2020/twelve.nim
new file mode 100644
index 0000000..fc93243
--- /dev/null
+++ b/2020/twelve.nim
@@ -0,0 +1,62 @@
+# Day Twelve: Rain Risk
+import os, strutils, sequtils, math, sugar
+
+let input: string = paramStr(1)
+let instructions: seq[tuple[action: char, value: int]] =
+ map(split(strip(readFile(input)), '\n'),
+ instruction => (instruction[0], parseInt(instruction[1..^1])))
+
+var ferry, actual: tuple[latitude, longitude, bearing: int] = (0, 0, 0)
+var waypoint: tuple[latitude, longitude: int] = (1, 10)
+for instruction in instructions:
+ let value: int = instruction.value
+ let current: tuple[latitude, longitude: int] = waypoint
+ case instruction.action
+ of 'N':
+ inc(ferry.latitude, value)
+ inc(waypoint.latitude, value)
+ of 'S':
+ dec(ferry.latitude, value)
+ dec(waypoint.latitude, value)
+ of 'E':
+ inc(ferry.longitude, value)
+ inc(waypoint.longitude, value)
+ of 'W':
+ dec(ferry.longitude, value)
+ dec(waypoint.longitude, value)
+ of 'L':
+ inc(ferry.bearing, value)
+ let bearing: float = degToRad(toFloat(value))
+ case value
+ of 0, 180:
+ waypoint.latitude = sgn(cos(bearing)) * current.latitude
+ waypoint.longitude = sgn(cos(bearing)) * current.longitude
+ of 90, 270:
+ waypoint.latitude = sgn(sin(bearing)) * current.longitude
+ waypoint.longitude = -sgn(sin(bearing)) * current.latitude
+ else:
+ discard
+ of 'R':
+ dec(ferry.bearing, value)
+ let bearing: float = degToRad(toFloat(value))
+ case value
+ of 0, 180:
+ waypoint.latitude = sgn(cos(bearing)) * current.latitude
+ waypoint.longitude = sgn(cos(bearing)) * current.longitude
+ of 90, 270:
+ waypoint.latitude = -sgn(sin(bearing)) * current.longitude
+ waypoint.longitude = sgn(sin(bearing)) * current.latitude
+ else:
+ discard
+ of 'F':
+ let bearing: float = degToRad(toFloat(ferry.bearing))
+ if abs(cos(bearing)) == 1.0:
+ inc(ferry.longitude, sgn(cos(bearing)) * value)
+ elif abs(sin(bearing)) == 1.0:
+ inc(ferry.latitude, sgn(sin(bearing)) * value)
+ inc(actual.longitude, value * waypoint.longitude)
+ inc(actual.latitude, value * waypoint.latitude)
+ else:
+ discard
+echo abs(ferry.longitude) + abs(ferry.latitude)
+echo abs(actual.longitude) + abs(actual.latitude)
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-10-16 12:24:00 +0000